See #8.
Oh, and might add:
I'm thinking about some sort of future, where an asteroid has hit the earth causing a full stop on day and night.
This makes a half of the planet ice, and the other lava or something. Between this two halfs there is a "line", where extreme temperatures cancel each other thus making it habitable.

Since rain, oceans, lakes, seas or even rivers are so scarce in a place like this; the last remnants of the human race have found their way through science for making water out of other materials oxigen and hydrogen maybe.
After being capable of creating water, it's time to take the next step:
Save what's left or even re-create the lost aquatic species of Earth, but that goal cannot be accomplished in a stationary place. No, it needs to be mobile and able to pack laboratories, houses (or flats) large amounts of water and in this case, hangars.

You are on to something with this idea of yours. It has something that I know I would love and I encourage you to do so. If you ever get an actual representation of your ideas out to be bought I think I would buy it simply because its in an area I love. Please do make it a reality!